Sounds like Ryan may have died from his Doctor's malpractice:
"Psychiatrist Dr. Sabino Ferreira de Faria was called by Gracie's wife after his arrest and attended to him at the jail.
The doctor has allegedly stated that he administered the following drugs to Gracie to calm him down: Haldol (a powerful antipsychotic), Fenergan (which has a side effect of sleepiness), Topamax (for Migraines), Dienpax (tranquilizers), and OmniPlex (relaxant). The doctor remained with Gracie most of the night, and was notified of Gracie's death as he was returning home. The cause of death has not yet been released by the medical examiner."
(from
http://www.bloodyelbow.com/story/2007/12/16/16357/786)
and this, from
http://ufcvideoz.com/2007/12/19/cause-of-ryan-gracies-death-questioned/
"Called by the family, psychiatrist Sabino de Farias Ferreira Neto accompanied the fighter and took a urine sample, which indicated the presence of drugs in Gracie’s body. The doctor said he provided at least six types of medication. Gracie, who was alone in his cell, was found dead Saturday around 8 a.m.
The Condepe (State Council on the Rights of the Human Person) questioned the procedure of the police to allow a doctor to monitor the fighter at the station. The Gracie family has said it will inquire about the doctor and the State over the death.
“Doctor Sabino is crazy, a murderer,” FlĆ”via Gracie, sister of the fighter, said in statements to the Brazilian press. “I told him to stop giving medicine to my brother. He said it was to prevent Ryan from being aggressive at the station. I argued that too much medicine would hurt, and the doctor replied that any remedy hurt, even aspirin.”
“Ryan, although wrong, had to be arrested and charged for crimes,” said Robson Gracie, Ryan’s father. “But his death is another thing. I will inquire about that quack doctor.”
Neto denied that the cocktail of drugs he gave Gracie is responsible for his death.
“As I told a colleague, the dose that was applied was so little,” he said. “I have the greatest regret for what happened, but I fought against this with all I know.”
Neto said he understands the pain of the family when they announced that they would inquire about him.
“It is a right of anyone,” he said. “I understand and respect the emotional experience for them at this time.”
The Condepe also wants to investigate the conduct of police and the Medical Legal Institute because Gracie was not taken to an emergency room, even though he had “suffered blows to the head and was under the influence of drugs.”
Gracie was buried Sunday in Rio de Janeiro at the age of 33. He was wearing a gi and his black belt."